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combined with scraper or collector box
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Industry
CPC
E21C27/42
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21C
MINING OR QUARRYING
E21C27/00
Machines which completely free the mineral from the seam
Current Industry
E21C27/42
combined with scraper or collector box
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Patents Grants
last 30 patents
Information
Patent Grant
2577924
Patent number
2,577,924
Issue date
Dec 11, 1951
E21 - EARTH DRILLING MINING
Information
Patent Grant
1704918
Patent number
1,704,918
Issue date
Mar 12, 1929
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
Information
Patent Application
A CUTTING HEAD ASSEMBLY
Publication number
20240309761
Publication date
Sep 19, 2024
OPTIMA MINING SYSTEMS PTY LTD
Benjamin Charles Michael BROWN
E21 - EARTH DRILLING MINING